Ubuntu downloads

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http://www.ubuntux.org – I installed Ubuntu yesterday and its finally running right(I think.) I found a website for Linux users https://help.ubuntu.com/community/ListOfOpenSourcePrograms and im trying to download a antivirus. But whenever I try to download it I get an error saying that the End-of-central directory signature not found. Either this file is not a zip file or it constitutes one disk of a multi part archive...ect. Help please? (Distributions)